22      * @param AbstractNode $a
26     public static function sortById(AbstractNode $a, AbstractNode $b): int  argument
29         $pathA = explode(':', $a->getId());
45      * @param AbstractNode $a
49     public static function sortByNsFirstThenId(AbstractNode $a, AbstractNode $b): int  argument
51         $res = self::sortByNsFirst($a, $b);
52         if ($res === 0) $res = self::sortById($a, $b);
59      * @param AbstractNode $a
63     public static function sortByTitle(AbstractNode $a, AbstractNode $b): int  argument
65         return Sort::strcmp($a->getTitle(), $b->getTitle());
71      * @param AbstractNode $a
75     public static function sortByNsFirstThenTitle(AbstractNode $a, AbstractNode $b): int  argument
77         $res = self::sortByNsFirst($a, $b);
78         if ($res === 0) $res = self::sortByTitle($a, $b);
85      * @param AbstractNode $a
89     protected static function sortByNsFirst(AbstractNode $a, AbstractNode $b): int  argument
91         $isAaNs = ($a instanceof WikiNamespace);